fix(token-dialog): display token button when it fails

If the token dialog failed, due to the the token variable was filled, the "Token" button was hidden: need to clear the token field.

src/client/app/components/token-dialog/token-dialog.controller.js

@@ -40,6 +40,7 @@ export class TokenDialogController {
             });
         }).catch(err => {
             this.state.tokenModalIsOpen = false;
+            this.state.tokenInfo.token = "";
             ToastsService.addToast(err);
         });
     }